Chain grizzly.



J. C. BARR.

CHAIN GRlZZLY.

APPLICATION FILED MAY27. I916- 1,276,005. Patented Aug. 20, 1918.

I7 III l I UNITED STATES PATENT OFFICE.

JOSEPH C. BARR, OF RIVERTON, MINNESOTA, ASSIGNOR 'IO ALLIS-CHALMERSMANU- FACTURIN G COMPANY, OF MILWAUKEE, WISCONSIN, A. CORPORATION OFDELA- WARE.

CHAIN GRIZZLY.

Specification of Letters Patent.

Patented Aug. 20, 1918.

To all whom it may concern.

Be it known that I, Josnrn C. BARR, a citizen of the United States,residing at Riverton, in the county of Crow Wing and State of Minnesota,have invented a certain new and useful Improvement in Chain Grizzlies,of which the following is a specification.

This invention relates to improvements in the construction of screeningor separating devices, and is particularly applicable to chain grizzliesfor screening relatively coarse materials.

An object of the invention is to provide a grizzly which is simple inconstruction and efficient in operation. One of the more specificobjects is to provide a chain grizzly of maximum capacity at minimumcost of construction and of maintenance. Another specific object is toprovide means for effectively preventing clogging of the screeningopenings of a grizzly. A further specific object is to provide a devicewhich will produce uniform separation of the coarse material from thefines. Still another specific object is to provide a grizzly which isentirely automatic in its operation.

These and other objects are accomplished primarily by forming thegrizzly of a series of substantially parallel endless chains, adjacentchains being movable at different speeds. The chains are movablesimultaneously from a common source of power and are associated withcooperating structure in such a manner that a simple and highlyefficient grizzly is produced.

A clear conception of an embodiment of the invention may be had byreferring to the drawing accompanying and forming a part of thisspecification in which like re erence characters designate the same orsimilar parts in the various views.

Figure 1 is a fragmentary top view of a chain grizzly embodying theinvention.

Fig. 2 is a fragmentary transverse vertical section through a chaingrizzly and associated structure.

Fig. 3 is a transverse vertical section through the chain grizzly, thesection being taken along the line IIIIII of Fig. 1 looking in thedirection of the arrows, and the chains having been omitted.

Fig. 4 is an enlarged transverse vertical section through one of the endsprockets of the grizzly.

The chain grizzly disclosed comprises a series of relatively shortchains 1 and a second series of longer chains 2, arranged substantiallyparallel to and alternating with the short chains 1 of the first series.The chains 1, 2, are formed as endless elements comprising alternatevertical and horizontal links, the former of which form upwardlyextending projections and engage end sprockets or wheels 21, 22,respectively. The wheels 21 are of somewhat smaller external diameterthan the wheels 22. The wheels 21, 22, are secured to the shafts 11, 12,by means of keys 23 or other suitable fastening devices. The front shaft11 is mounted in suitable bearings 24 secured to the main frame 17, andas disclosed is rotatable by any suitable driving means, not shown. Therear shaft 12 is rotatably mounted in bearings 25 secured to the mainframe 17, and may also be employed as a driving shaft if so desired. Theupper portions of the chains 1, 2, intermediate the shafts 11, 12, arevertically supported by means of idler chain wheels 4 which arerotatably mounted upon idler shafts 14 supported in bearings 5 securedto the mam frame 17. The lower portions of the chains 1, 2, intermediatethe shafts 11, 12, are verticall supported by means of idler chain whees 4 rotatable upon shafts 14 carried in bearings 15 supported bybrackets 16. The supports for the upper portions of the chains 1, 2, aregreater in number than those for the lower portions. The idler chainwheels 4 are preferably formed alike, and are freely rotatable upontheir supporting shafts 14, Elongated bars 13 are mounted upon theshafts 14 between adjacent idler chain wheels 4, and extend from one endof the grizzly to the other.

The upper edges of v these bars 13 are below the upper extremities ofthe vertical chain links, lying substantiall in the plane of the uppersurfaces 0 the horizontal chain links, see

The side beams 6 located above the chains 1, 2, form a screening chamber3 above the upper chain-sections of the grizzly and also form supportsfor the rails 10 upon which the dumpmg ear 9 is adapted to travel. Adischarge hopper 7 is located below the grizzly in vertical alinementwith the screening chamber 3. A crusher 8, of any suitable form, islocated at the extreme end of the grizzly.

During the normal operation of the device the chains 1, 2, are moved inan anticlockwise direction as viewed in Fig. 2, by means of the powerapplied to either of the shafts 11, 12. The material to be screened isdeposited upon the upper portions of the chains 1, 2, through thescreening chamber 3, and is separated, the fine material passing throughthe spaces between adjacent chains and into the hopper 7, and theoversize being eventually delivered over the end of the grizzly to thecrusher 8.

Due to the formation of the chain driving wheels 21, 22, of dilferentdiameters, adjacent chains 1, 2, of the grizzly will travel at differentspeeds thereby continually shifting the material and causing it todistribute itself over and to pass through the grizzly more readily thanif the chains were all travelin at the same speeds. The elongated bars13 ocated between adjacent chains produce uniform separation bypreventing large pieces of material from wed ing between and spreadingthe adjacent c ains to cause a relatively large through opening for thepassage of material. The bars 13 in addition to reventing spreadin ofthe adjacent chains 1, 2, assist these chains in sup porting the weightof the charge of the material. By havin the upper portions of the chains1, 2, whic are directly adjacent the screening chamber 3 movable insubstantially a horizontal plane, the material will tend to moreuniformly distribute itself over the entire screening area of thegrizzly than if the upper portion of the grizzly were troughed orotherwise distorted. The projections afiorded by the vertical chainlinks, serve to rapidly advance the material along the rizzly and alsoagitate the charge, ther y producing a rapid screenin action.

W lie the grizzly has been disc osed as being formed of a series oiendless chains, it is not intended to limit the invention to suchdisclosure. It is however desirable to have the grizzly formed ofendless elements, as the problem of driving'such elements is arelatively simple one.

It should be understood that it is not desired to be limited to theexact details of construction shown and described, for obviousmodifications will occur to a person skilled in the art.

It is claimed and desired to secure by Letters Patent,

1. In combination, a plurality of spaced stationary material-supportingelements,

and movable conveying elements in the spaces between said stationaryelements, one of said conveyin elements being movable at a difl'erentspeed than that of another.

2. In combination, a plurality of spaced stationary material-supportingelements, and movable conveyin elements in the spaces betweensaid.stat1onary elements and having projections extending upwardlybeyond said stationary elements, one of said conveying elements beingmovable at a different speed than that of another.

3. In combination, a plurality of spaced stationary material-supportingelements, and movable conveying elements in the spaces between saidstationary elements, one of said conveying elements'on one side of astationary element being movable at a different speed than that of saidconveying element on the opposite side of said stationary element.

4. In combination, a series of spaced parallel stationarymaterial-supporting bars, and movable conveying chains in the s acesbetween said bars, one of said chains eing movable at a different speedthan that of another.

- 5. In combination, a series of spaced parallel stationarymaterial-supporting bars, and movable conveying chains in the spacesbetween said bars and having projections extending upwardly beyond saidbars, said chains on opposite sides of each of said bars beingrelatively lon 'tudinally movable and being movable at di erent speeds.

6. In combination, a series of spaced parallel horizontal stationarymaterial-supportmg bars, and movable endless conveying chains in thespaces between said bars and having projections extending upwardlybeyond sald bars, said chains on opposite sides of each of said barsbeing movable at different speeds and alternate chains being movable atthe same speed.

7. In combination, a series of spaced parallel stationarymaterial-supporting bars, and movable conveying chains in the spacesbetween said bars and having projections extendin upwardly beyond saidbars, one of said c ams being movable at a difi'erent speed than that ofanother.

8'. In combination, a pluralit of spaced lateraily uny'ieldable materia-sup orting elements, and movable conveying e ements n the spacesbetween said material-supportmg elements, one of said conveying elamentsbein movable at a dilferent s said unyieldable elements, one of saideonthan that 0 another. veying elements being movable at a dif- 9. Incombination apluralit of spaced ferent speed than that of another.laterally un ieldable materia -supporting In testimony whereof, thesignature of 10 5 elements, an laterally ieldable movable the inventoris aflixed hereto.

conveying elements in tlle spaces between JOSEPH O. BARR.

It is hereby certified that Letters Patent No. 1,276,005,grantediAugust. 20, 1918, upon the application of Joseph C. Barr, ofKi'verton, Minnesota, for an improvement in Chain Grizzlies, wereerroneously issued to Allis-Chalmers Manufacturing Company, as assigneeof the entire interest in said invention, whereas said Let-tors Patentshould have been issued to the inventor, said Barr, and Ame-ChalmersManufacturing Company, said corporation being'mer of one-half interestonly, as shown by the records of the case in this office; and that thes'aid Letters Patent should be read with this correction therein thatthe same may conform to the record of the case in the Patent Oflioe.

Signed and-sealed this 8th day of October, A. D., 1918.

' R. F; WHITEHEAD,

Acting Commissioner ofPa/imts.

